linux-kernel - Re: [PATCH] net: fec: defer probe if PHY on external MDIO bus is not available

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Message-ID: <YXK1E9LLDCfajzmR@lunn.ch>
Date:   Fri, 22 Oct 2021 14:56:51 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Matthias Schiffer <matthias.schiffer@...tq-group.com>
Cc:     Joakim Zhang <qiangqing.zhang@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: fec: defer probe if PHY on external MDIO bus is not
 available

> Hmm, lots of network drivers? I tried to find an example, but all
> drivers that generate -EPROBE_DEFER for missing PHYs at all don't have
> an internal MDIO bus and thus avoid the circular dependency.

Try drivers/net/dsa.

These often have mdio busses which get registered and then
unregistered. There are also IRQ drivers which do the same.

	Andrew